Similar to https://stackoverflow.com/a/24811490/2251785, but I can't find those urls from official doc. Here are the source code archive URLs from GitHub's documentation, using github/codeql as an example.

You can install any zip file directly with this:

pip install https://github.com/github/codeql/archive/refs/heads/main.zip

Ref: https://docs.github.com/en/repositories/working-with-files/using-files/downloading-source-code-archives#source-code-archive-urls